How is the generator sizing with driving VFD
How is the generator sizing with driving VFD
(OP)
I have 2750kw 6,3kV motor for process and driving this motor with variable speed drive at the 6,3kV , and also , I want to supply this motor with generator sets , but How can I calculate what about generator sets we need , Please could you help





RE: How is the generator sizing with driving VFD
As for the generator, we can't answer that question without a ton more info.
What you should do is find all the generator companies around you that could support you locally, and start talking to them. They will all be happy to analyze your situation and give you advice using the necessary details.
You can then run the designated solution by us for an experence based check.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: How is the generator sizing with driving VFD
The main trap to watch out for is that the VFD manufacturers will try to sell you on how the VFD presents a .95 power factor to the system, but this is disingenuous. The displacement power factor may be .95, but the distortion power factor is usually much worse; .75 or lower. This is often unimportant to utility supplies (at least as far as rate penalties go), but is critical when you are running on a fixed source such as a generator. Your generator will need to supply ALL of that power.
RE: How is the generator sizing with driving VFD
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RE: How is the generator sizing with driving VFD
Is there a definition for displacement and distortion power factor?
RE: How is the generator sizing with driving VFD
LM Photonics Power Factor paper
Scroll down (if you don't want to read the whole thing) to the section on Inverters, then again to the very end.
Displacement PF would be the "normal" pf we think of, i.e. cos phi of the angular difference between voltage and current. Distortion pf is the result of harmonics in non-linear loads and can be crudely defined as kW/kVA regardless of what you think you see on a meter not designed to react to harmonics.
RE: How is the generator sizing with driving VFD
ht
JRaef.com
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RE: How is the generator sizing with driving VFD
Thanks for the information. It will help me in my work. If I understand both links correctly, Power Factor would be kW/kVA as measured by a True RMS Power Meter. Displacement Power Factor is the cosine of the angle between the voltage and the current (which would be equal to the Power Factor for a sinusoidal system). Distortion Power Factor = Power Factor/Displacement Power Factor.
RE: How is the generator sizing with driving VFD
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If we learn from our mistakes I'm getting a great education!
RE: How is the generator sizing with driving VFD